"Tuning frictional behavior on the fly has been a long-standing engineering dream," said co-author Katia Bertoldi of Harvard University. "This new insight into how surface geometry governs slip pulses paves the way for tunable frictional metamaterials that can transition from low-friction to high-grip states on demand.” In addition, the dynamics revealed by these results are similar to those of tectonic faults and thus give scientists a new model for the mechanics of earthquakes, according to their new paper published in the journal Nature.
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f(x1,x2)=x1⋅Swish(x2)=x1⋅(x2⋅σ(x2))，详情可参考91视频
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根据IDC的预测，2026年中国智能手机市场上，200美元以下市场份额将缩减4.3个百分点，达到20.0%；200至400美元市场份额34.0%，减少0.3个百分点；400至600美元市场份额10.1%，减少0.8个百分点。高盛分析数据亦显示，中端市场份额自2021年的35%大幅下滑，预计到2027年将降至23%。